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See Chinese contents: GB 28736-2012 GB 28736-2012: Minimum allowable values of energy efficiency and energy efficiency grades for arc welding machines
This Standard specifies the energy efficiency grade, energy efficiency limit value, energy conservation evaluation value and test method of arc welding machines. This Standard applies to arc welding machines that are powered by the voltage specified in Table 1 of GB 156, and that are designed for industrial and professional use.
